Recovery of zinc from EAF dust by alkaline extraction
In this paper,a series of lab-scale experiments have been focused on the zinc recovery from electric arc furnace (EAF) dust by alkaline extraction,combining with the novel alkaline zinc electrowinning technology.Effects of several leaching variables,i.e.leaching time (1-3 h),NaOH concentration (150-400 g/L),solid/liquid ratio (S/L,1/5-1/12),temperature (30-90 ℃) and stirring speed (300-500 rpm) on zinc recovery (％) were investigated.Around 84 ％Zn and 92 ％ Pb were respectively recovered when the leaching process was operated with 250 g/L NaOH and S/L 1/10 at 90 ℃ for 2 h.After Pb was selectively removed by sodium sulfide precipitation,the alkaline zinc solution was subjected to electrolysis and zinc powder with a purity of 98.5 ％ was then obtained.The leaching residue is suitable for safe disposal,while the purifying residue can be marketed for lead recovering.
electric arc furnace dust hazardous waste zinc alkaline leach electrolysis
Jiachao Jiang Xiaoyu Yang Youcai Zhao
State Key Laboratory of Pollution Control and Resource Reuse,Tongji University,Shanghai 200092,China Environmental Monitoring Station of Jinan City,Shandong 250014,China
国际会议
哈尔滨
英文
2299-2304
2010-07-24（万方平台首次上网日期，不代表论文的发表时间）